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REVENUE - Disaggregation of Revenue (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2022 | Sep. 30, 2021
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | $ 2,298,976 | $ 2,106,038 | $ 4,548,576 | $ 4,095,104
Revenue from Contract with Customer Benchmark | Product Concentration Risk |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Concentration risk (as a percent) | 100.00% | 100.00% | 100.00% | 100.00%
Revenue from Contract with Customer Benchmark | Customer Concentration Risk |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Concentration risk (as a percent) | 100.00% | 100.00% | 100.00% | 100.00%
Revenue from Contract with Customer Benchmark | Contractor Concentration Type Risk |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Concentration risk (as a percent) | 100.00% | 100.00% | 100.00% | 100.00%
Prime Contractor |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | $ 2,179,375 | $ 1,978,216 | $ 4,310,670 | $ 3,839,939
Prime Contractor | Revenue from Contract with Customer Benchmark | Contractor Concentration Type Risk |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Concentration risk (as a percent) | 95.00% | 94.00% | 95.00% | 94.00%
Subcontractor |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | $ 119,601 | $ 127,822 | $ 237,906 | $ 255,165
Subcontractor | Revenue from Contract with Customer Benchmark | Contractor Concentration Type Risk |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Concentration risk (as a percent) | 5.00% | 6.00% | 5.00% | 6.00%
Total U.S. government |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | $ 2,235,433 | $ 2,055,016 | $ 4,422,021 | $ 4,000,591
Total U.S. government | Revenue from Contract with Customer Benchmark | Customer Concentration Risk |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Concentration risk (as a percent) | 97.00% | 98.00% | 97.00% | 98.00%
Defense Clients | Total U.S. government |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | $ 1,019,108 | $ 996,463 | $ 2,039,099 | $ 1,970,069
Defense Clients | Total U.S. government | Revenue from Contract with Customer Benchmark | Customer Concentration Risk |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Concentration risk (as a percent) | 44.00% | 48.00% | 45.00% | 48.00%
Intelligence Clients | Total U.S. government |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | $ 432,543 | $ 396,415 | $ 841,426 | $ 775,588
Intelligence Clients | Total U.S. government | Revenue from Contract with Customer Benchmark | Customer Concentration Risk |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Concentration risk (as a percent) | 19.00% | 19.00% | 18.00% | 19.00%
Civil Clients | Total U.S. government |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | $ 783,782 | $ 662,138 | $ 1,541,496 | $ 1,254,934
Civil Clients | Total U.S. government | Revenue from Contract with Customer Benchmark | Customer Concentration Risk |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Concentration risk (as a percent) | 34.00% | 31.00% | 34.00% | 31.00%
Global Commercial Clients |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | $ 63,543 | $ 51,022 | $ 126,555 | $ 94,513
Global Commercial Clients | Revenue from Contract with Customer Benchmark | Customer Concentration Risk |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Concentration risk (as a percent) | 3.00% | 2.00% | 3.00% | 2.00%
Cost-reimbursable |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | $ 1,201,407 | $ 1,127,189 | $ 2,392,235 | $ 2,242,614
Cost-reimbursable | Revenue from Contract with Customer Benchmark | Product Concentration Risk |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Concentration risk (as a percent) | 52.00% | 53.00% | 53.00% | 55.00%
Time-and-materials |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | $ 564,438 | $ 500,263 | $ 1,110,340 | $ 997,713
Time-and-materials | Revenue from Contract with Customer Benchmark | Product Concentration Risk |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Concentration risk (as a percent) | 25.00% | 24.00% | 24.00% | 24.00%
Fixed-price |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | $ 533,131 | $ 478,586 | $ 1,046,001 | $ 854,777
Fixed-price | Revenue from Contract with Customer Benchmark | Product Concentration Risk |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Concentration risk (as a percent) | 23.00% | 23.00% | 23.00% | 21.00%

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